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Who's responsible for this nonsense? See the About page.
Is Fluid Free? Fluid is totally free for use... go ahead, try it out!.
Is Fluid Open Source? Nope. However, much of Fluid's functionality is built on other open source projects. Are you looking for an open source web rendering engine? Try WebKit or Gecko. Looking for an open source browser built on WebKit or Gecko? Try Shiira or Camino. Looking for an open source Site Specific Browser? Try Mozilla Prism. What the heck do you need me for? ;0]
Fluid seems awfully similar to Mozilla Prism. What gives? Fluid was very much inspired by the excellent Mozilla Prism project, Adobe Air, and other, earlier Site Specific Browsers. Many people think Prism was the first product in this category, but actually, Prism itself was preceded by other SSB products. Fluid's goal is to be the best, most native-feeling SSB for Mac OS X Leopard. Prism is cross-platform, which is a huge benefit for lots of users. However, many Mac users prefer a more tightly-integrated, Mac-like SSB application. That is Fluid's niche. Fluid is a thoroughly native, Cocoa Mac OS X application. No compromises or least-common-denominator tradeoffs.
Is Fluid available for Tiger? No, Fluid is not available for Tiger. Fluid is thoroughly Leopard-only, leveraging many Leopard features and developer tools.
Can I somehow redistribute SSBs I create with Fluid to friends/coworkers? Actually, I'd very much prefer you didn't do that. I'm providing Fluid as free software, and I would like as much exposure for the product as I can get. Please direct your friends/coworkers to the Fluid website and ask them to download it themselves and try it out. Fluid is an end-user tool, not an application development or deployment platform. For the latter, check out Adobe Air.